This is truly inspired work. The blog Blackboards in Porn collects examples from the student/teacher porn genre that actually feature chemical formulae, mathematical equations, etc. on the chalk boards located on-set...and then, on behalf of nerds everywhere who just can't help themselves, evaluates them based on their degree of academic difficulty, clarity, and overall accuracy.

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Here's the entry for the blackboard featured up top:

Mathematics - university/nursery school level.

This is clearly an extremely advanced level mathematical course, focusing on the Peano axioms for the natural numbers which formalised mathematics in the late 19th century. This course would culminate with Gödel's second incompleteness theorem which shows that the consitency of the Peano axioms cannot be formalised within Peano arithmetic itself.

Alternatively, it could be that the pupil, even at her advanced age, hasn't grasped that 1 + 1 = 2, and that all the after school one-to-one lessons in the world aren't going to work. Indeed, she probably won't even understand what 'one-to-one' means.

8/10 - loses two marks for 'math'.

Check out a few more examples over at Blackboards in Porn (it's safe for work). There's not a whole lot of content to look through yet, but you're encouraged to send them any examples you may stumble upon in the course of your own...evaluations.